Ludwig prillwitz



(No Model.)

L. PRILLWITZ; BORING TOOL HOLDER.

Patented June 1'7, 1890.

Fll3.2

FIE-1.3

FIG]

I INVENTEIR aoyl ws-lw u WITN E5 5E5 TERS co., mom-urn U ITED STATES PATENT OFFICE.

LUDWIG PRILLl/VITZ, OF NE? YORK, N. Y.

BORING-TOOL HOLDER.

SPECIFICATION forming part of Letters Patent No. 430,148, dated June 17, 1890.

Application filed October 28, 1889.

To all whom it may concern.-

Be it known that I, LUDWIG PRILLWITZ, of New York city, New York, have invented an Improved Universal Boring-Tool Holder for Lathes, of which the following is a specification.

This invention relates to a boring tool holder for lathes which is made adjustable for the purpose of grasping tool-shanks of different diameters.

The invention consists in the various features of improvement more fully pointed out in the claims.

In the accompanying drawings, Figure 1 is a side elevation of my improved tool-holder. Fig. 2 is a verticallongitudinal section thereof on line y y, Fig. 5. Fig. 3 is an end view thereof; Fig. 4, a cross-section on line 00 m, Fig. 2, with the wedge removed; Fig. 5, atop View of the tool-holder; Fig. 0, a perspective View of the wedge; Fig. 7, a perspective of the lower or movable jaw; Fig. 8, a side view thereof; Fig. 9, a side view of the tool-shank provided with the bushing, and Fig. 10 an end view of the bushing.

The letter a represents the block or body of the tool-holder of a lathe, in which is held the boring-tool that acts against the work secured to the head-stock, as usual. From the block a there projects upwardly a U-shaped yoke b, the upper rounded section b of which constitutes the fixed jaw. Within this yoke there is slipped the movable jaw 0, free to be raised or lowered. Beneath the jaw 0 there is placed into the yoke a wedge (1, having a groove (1 in its lower face. This groove is entered into by a screw-rod e, which has a collar 6 at each end of the wedge, so as to draw the wedge with it. The forward end of the rod e is squared, so that it may be grasped by a key while its rear end engages athreaded lug f, projecting upwardly from the block a.

It will be seen that when the rod 6 is turned in one direction it will push the wedge into the yoke, and that if turned in the other direction it will draw the wedge out. In the former case the movable jaw is raised, while in the latter case it is free to be lowered.

In order to prevent the movable jaw from Serial No. 3 2 8, 3 9 3. (N0 model.)

with a transverse groove 0', that is engaged by a pin 0 spanning the yoke. I

It is clear that the tool-holder may be readily adjusted to accommodate tool-shanks A of different diameters.

If atool-shank is to be clasped which is of a smaller diameter than the minimum distance between the jaws b c, Isurround it with a split metal bushing g, that fills up the space between the tool-shank and the j aws. To increase the elasticity of this bushing, I provide it with a groove 9 opposite to its split end.

hat I claim -is 1. The combination of block a with a yoke and with a movable adjustable jaw within said yoke, substantially as specified.

2. The combination of block a, having yoke b, with a movable jaw 0 within said yoke, and with a wedge 01 beneath said jaw, substantially as specified.

3. The combination of block at, having yoke b, with a movable jaw c, a wedge cl, having groove d, a lug f on the block, and with a screw-rod c engaging the lug and passing through the groove (1, substantially as specitied.

4. The combination of block (1, having yoke b, with'a movable jaw c, a wedge d, having groove 01', a lug f on the block, and a screwrod ,6, having a collar 6' at each end of the wedge, one end of the rod being squared and the other end engaging the lug f, substantially as specified.

5. The combination of block a, having a yoke, with a movable jaw 0, having groove 0, and with a pin 0 engaging said groove, and with an adjustable wedge beneath the jaw, substantially as specified.

6. The combination of block 0,, having a yoke with a movable jaw within said yoke and with a split bushing g, adapted to be introduced between the yoke and the movable jaw, substantially as specified.

LUDVVIG PRILLWVITZ.

Witnesses:

F. v. BRIESEN, A. J ONGHMANS. 

